Operating means



July 27 1926.

A. H. STEBBINS OPERATING MEANS Filed D60. 20, 1924 N M KN x w T N W R \NW m N r I 5 Ev Em MBMW w wwwwm m I- Patented duty 22?,

ALBERT STEBBINS, F LOS AFQEGELEEi, OALEEiZiFL-NIA.

OPERATING MEANS.

Application filed December 20, 19M. S6Ti21l'1l0fi757flV3.

This invention par a. vibrato; trator necks, frames, and morein'npartinq a pro seine. r

O 'tQSSlVQ is commonly er. p along the inateria' 1o deck or screen,

other purposes.

may he employed f r be support m g iraine a strong and durable form 0'Line,

2 means for producing a progr ovement and which extremely simple inconstructiona in carrying out the present invention an operating leveris eilployed which is con- :30 the frame to be vibrated, and a necte'lto cam is-provided to rock the lever so that it i l pull the frame inone direction and th 1 th ever to ailow the frame to more 7 in J16opposite direction undo r J5 action of compre sed springs or other ingymeans.

One fdiiilljt of the present invention ie sides in a roller orantifriction device interposed between the lever and cam to elin'iiinatefriction between these elements. Another feature of the inventionresides in the construction of the lever and the connections forimparting movement from the lever to the frame that is vibrated.

Other features of the invention in addition to the above will behereinafter d scribed in connection with the accompanying drawingsillustrating good, practical forms of the invention.

In the drawing" Fig. 1 is a side elevation of a machine employing theoperating means of the presentinvention.

Fig. 2 is a sectional view taken on line 2-2 of Fig. l.

urged in t.

p ses, and

tion shown, i "Jr-4h base ing braces 18.

The frame 10 may con having the usual screening centrator deck or otherdevii a vibrato movement. The

t 101" l usiyc of t ear (ll-L i, A 'lfhe oppo re provided uith do n ms16 havnn extendi' therefrom A The stub shafts 1.? Lcari blocks 18 sec".

' arms k slight upthrow movegtiiiiV i ti r is lie; sna k I, I A case byhr the shaft W21 rdiy extending shafts 'i 'i' n nil LiiG (JO ated in acup se and the other end 15 s ted i ad ustahiy supported by the or morecoiled s rin 's th reac ed hoit extending through the lu secured. to thesupporting base.

The means for positively moving the frame 10 in the opposite directionconsists of a lever 24 supported for rocking movement by thetransversely extending shaft 25 the ends of Which are supported bybearings 26. The lever 24 has an enlarged head 27 that encircles theshaft 25 and in this head are formed the cable-receiving grooves 28. iheconnection between the lever 24 and frame 10 comprises a cable 29, anintermediate portion of which is looped about the lever at 30 and thetwo cable strands thus formed extend around the head 27 Within thegrooves 28, and the ends of these strands are fastened to a block 31secured by threads or other means to the bolt 32.

movements to the frame 10, and the lever is provided with a roller 39against which the cam 35 rotates. In this manner friction between thelever and cam is eliminated. The outer end of the lever 24; may beforked to receive the roller 39 between the forked arms and the rolleris mounted upon a pin d0 secured to the forked arm. If the cam androller are both formed of metal, it may be desirable to reduce the shockand noise produced by one striking the other and this may beaccomplished by providing the roller with a tire l-l formed of rubber orother yielding material.

The cam shown in Figs. 1 and 2 is pro vided with two diametricallydisposed projections 42, and as the cam rotates in the directionindicated by the arrow the lever is gradually forced upwardly to pullthe frame 10 in a left-hand direction and is then suddenly released andforced in the opposite direction by the compressed springs 19 as theprojection i moves out of engagement with the roller 39. This permitsthe frame 10 to move rapidly in a right-hand direction until it issuddenly stopped by the roller 39 striking against the reduced diameterof the cam. Each time the movement of the frame is suddenly stopped thematerials being treated slide lengtnwise of the frame a slight distancein the desired progressive manner.

The cam 35 is constructed to impart a substantial progressive movementto the frame 10, while the difierently shaped cam 43 of F f will imparta much smoother movement to the device it operates. The arrangement ofthe cable shown provides a strong,

durable connection between the lever and frame, and the construction ofthe various parts described is such that they will not be readilyinjured by the dirt and dust that usually accompany the operation ofscreens and concentrators.

What is claimed is 1. in a device of the class described, a supportingbase, a frame supported by the base for back and forth movement,resilient means for urging the frame in one direction, and mechanism forforcing the frame in the opposite direction, comprising a pivoted leverhaving an enlarged head sur rounding the lever pivot, a cable having anintermediate portion iooped about the lever and having the pair ofstrands formed by the loop extending in the same direction about thehead to the frame to which they are anchored, roller at the outer end ofthe lever, and a rotating cam acting against said roller to rock thelever.

in a device of the class described, a supporting base, a frame supportedby the base for back and forth movement, yielding means for urging theframe in one direction, and mechanism for moving the frame in theopposite direction, comprising a pivoted lever having a head surroundingthe lever pivot, a cable having an intermediate portion looped about thelever and having the pair of strands formed by the loop extending in thesame direction about said head to the frame to which they are anchored,a roller mounted upon said lever and pro vided with a resilient tire,and a rotating cam acting against said roller to rock the lever.

in testimony whereof, I have signed my name to this specification.

ALBERT H. ST BBINS.

